Septal infarcts are associated with diagnostic Q waves in with an EKG tracing. Although it is usually associated with a septal infarct, it can occur with anatomic changes (vertical axis) due to lung disease or LVH (left ventricle chamber enlargement) and with intraventricular conduction defects such as (LAFB, LBBB, and WPW are rhythm disorders) or with hypertrophic cardiomyopathy (heart muscle enlargement).
Septal infarction is necrosis (dead) cells located in the wall that separates right and left chambers and the septum povides a pathway for electrical impulses (that would be the underlying cauise for any disordered electrical impulses...arrhthmia).
An EKG requires other tests, etc. as the EKG results are not conslusive.